US PATENT SUBCLASS 205 / 666
.~ Using mask

Current as of: June, 1999
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205 /   HD   ELECTROLYSIS: PROCESSES, COMPOSITIONS USED THEREIN, AND METHODS OF PREPARING THE COMPOSITIONS

640  DF  ELECTROLYTIC EROSION OF A WORKPIECE FOR SHAPE OR SURFACE CHANGE (E.G., ETCHING, POLISHING, ETC.) (PROCESS AND ELECTROLYTE COMPOSITION) {19}
666.~ Using mask {1}
667  DF  .~.~> Of photoresist or radiation resist

DEFINITION

Classification: 205/666

Using mask:

(under subclass 640) Process in which a workpiece surface to be eroded is provided with a distinguishable nonuniform covering which allows only part of the workpiece to contact the electrolyte.

(1) Note. The covering may be an adherent coating, a stencil, etc.

(2) Note. The nonuniformity of the covering is produced by a procedure or phenomenon other than the electrolytic erosion process itself.

(3) Note. The composition of the mask may bear a resemblance to that of the workpiece (e.g., the mask and workpiece may be different alloys of the same base metal) provided that the mask is identifiably separate from the

workpiece and will not be eroded at the same rate as the workpiece.

SEE OR SEARCH THIS CLASS, SUBCLASS:

656, for electrolytic erosion in which the workpiece has nonuniform internal electrical characteristics.

SEE OR SEARCH CLASS 156, Adhesive Bonding and Miscellaneous Chemical Manufacture, appropriate subclasses for laminating processes. See the search class note to Class 156 at the beginning of this class for the class line.

427, Coating Processes,

256+, for processes of forming a nonuniform coating, in general.